The act of granting authority to someone or something is the act of commissioning.

To commission is to charge someone with a task, giving them the authority do to do something in an official way. The gerund form of the verb, commissioning, can be used as a noun referring to the action of authorizing someone or something. You might attend a ceremony marking the commissioning of a group of new police officers or a new ship for service.

Definitions of commissioning
  1. noun
    the act of granting authority to undertake certain functions
    synonyms: commission
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    the commission that is given to a government and its policies through an electoral victory
    type of:
    authorisation, authorization, empowerment
    the act of conferring legality or sanction or formal warrant
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